摘要
为改善清洁压裂液的耐温性能,以十二烷基硫酸钠(SDS)、油酸钠(NaOA)、芥酸钾(KEU)及双α-磺化棕榈酸甲酯二钠盐(GS)为研究对象,考察不同无机盐、有机盐苄基三甲基氯化铵(BTAC)及Na_2CO_3/BTAC混合盐对表面活性剂水溶液性能的影响,优化出最佳清洁压裂液体系GS/Na_2CO_3/BTAC,其中ρ(GS)=1.8 g·L^(-1),ρ(Na_2CO_3+BTAC)=4.0 g·L^(-1),c(Na_2CO_3)/c(BTAC)=3∶1。利用表观黏度法考察GS/Na_2CO_3/BTAC体系的耐温性能及耐剪切性能,同时研究该体系的携砂性和破胶性。结果表明:在相同测试条件下,GS/Na_2CO_3/BTAC、GS/BTAC及GS/Na_2CO_3三种体系η_(max)分别为1 677.1 mPa·s,572.5 mPa·s及475.6 mPa·s。当温度从30℃上升至100℃时,GS/Na_2CO_3/BTAC体系的表观黏度η_a从1 426.3 mPa·s降至68.4 mPa·s;当T=100℃时,连续剪切120 min,GS/Na_2CO_3/BTAC体系的η_a始终保持在54.5 mPa·s。携砂比为10%时,GS/Na_2CO_3/BTAC体系的沉降速度为0.086 cm·min^(-1),75 min内彻底破胶,黏度仅为2.46 mPa·s,破胶液几乎无残渣。GS/Na_2CO_3/BTAC体系具有优越的耐温性能、耐剪切性能、携砂性能和破胶性能。
In order to improve the temperature resistance of clean fracturing fluid,with sodium dodecyl sulfate(SDS),sodium oleate(NaOA),potassium erucate(KEU)and anionic gemini surfactant as research subjects,the effect of different counterions,including kinds of inorganic salts,organic salt(Benzyltrimethylammonium Chloride,BTAC)and Na2CO3/BTAC mixture,on the properties of solutions is studied respectively.An optimized system of GS/Na2CO3/BTAC is obtained with a solution of 1.8 g·L^-1 GS as well as 4.0 g·L^-1(Na2CO3+BTAC)where the molar ratio of NaCO3 to BTAC is 3:1.The temperature and shear resistance of this optimized system is investigated by viscosimetry method.At the same time,the sand carrying and gel breaking properties of this system are also studied.The results show that,under the same test conditions,the maximum viscosity ηmax of GS/Na2CO3/BTAC,GS/BTAC and GS/Na2CO3 is 1677.1 mPa·s,572.5 mPa·s and 475.6 mPa·s,respectively.The apparent viscosity(ηa)of GS/Na2CO3/BTAC system decreases from 1426.3 mPa·s to 68.4 mPa·s when the temperature ranges from 30 ℃ to 100 ℃.At 100 ℃,the ηa of GS/Na2CO3/BTAC system still remains 54.5 mPa·s after shearing 120 min uninterruptedly.When the sand carrying ratio is 10%,the sedimentation rates of the seeds in this system is about 0.086 cm·min^-1 at 35 ℃ and the viscosity of the gel breaking liquid decreases to 2.46 mPa·s within 75 min without residue.The system of GS/Na2CO3/BTAC has excellent temperature resistance,shear resistance,sand carrying capability and gel breaking performance.
作者
穆瑞花
杨靖
赖小娟
MU Ruihua;YANG Jing;LAI Xiaojuan(School of Environmental and Chemical Engineering,Xi′an Polytechnic University,Xi′an 710048,China;School of Urban Planning and Municipal Engineering,Xi′an Polytechnic University,Xi′an 710048,China;College of Chemistry and Chemical Engineering,Shaanxi University of Science & Technology,Xi′an 710021,China)
出处
《纺织高校基础科学学报》
CAS
2019年第1期102-108,共7页
Basic Sciences Journal of Textile Universities
基金
国家自然科学基金(81302706
21573171)
陕西省教育厅专项科研计划项目(16JK1336)
陕西省重点研发计划(2017GY-121)
陕西省工业科技攻关项目(2016GY-193)
关键词
压裂液
耐温性
阴离子双子表面活性剂
fracturing fluid
temperature resistance
anionic gemini surfactant
